Furnace hood



July 31, 1928.

N. W. BETZOLD FURNACE HOOD Filed April 1925 2 Sheets-Sheet l v me/wtoz jiZZeZzoZZZ July 31, 1928.

1,679,150 N. w. BETZOLD FURNACE HOOD Filed April 6, 1925 2 Sheets-Sheet 2 canoe/whoa Patented July 31, 1928.

UNlTED STATES NICHOLAS N. BETZOLD, OF BRAINEBD, MINNESOTA,

FURNACE HOOD.

Application filed April 6, 1925. Serial No. 21,148.

My invention relates to improvements in furnaces of the type having lateral hot air escape pipes, or in fact, to any kind of hot air furnace having a substantially exposed o to from which heat can escape. I provide a liood adapted to extend over and around the upper end portion of the furnace to collect the escaping heat, said hood having a heat outlet adapted to lead to a register above, and being also provided with a 0001 air inlet. One object of the invention is to provide a construction in which the cool air inlet surrounds the usual lateral smoke pipe of the furnace, so that the air entering the 3 hood will be initially warmed by contact with said smoke pipe.

Another object of the invention is to provide a unique construction and arrangement of hangers for supporting the hood upon the furnace and for holding! the top said hood against sagging.

A still further object is to provide a hood having its annular side wall-formed of sheet metal plates which are detachably bolted to the top of the hood and also detachably bolted to each other in overlapping relation, so that adjacent edges of these plates may readily be notched with an ordinary pair of tinners shears, thus easily providing openings at necessary points to receive the usual hot air escape pipes from the furnace.

A still further object is to provide a hood of the character set forth which may be easily and inexpensivel manufactured, sold at small cost, and really installed by any one having average mechanical skill.

With the foregoing in view, the invention resides in the novel subject matter herein after described and claimed, the description being supplemented by the accompanying drawings.

Figure 1 is a perspective view showing the application of my invention to a conventional form of hotair furnace.

Fig. 2 is a detail vertical sectional view illustratin a slightly different form of construction or the cool air inlet neck. a

F ig. 3 is a detail horizontal sectional view as indicated by line 3-3 of Fig. 1.

Fig.. 4,- is a detail vertical section disclosing more particularly the construction of one of the mod hangers.

Fig. 5 is a perspective view of one of the sheet metal plates which form the annular ;ide wall of the hood.

' outlet 9, adapted to lead to a the upper extremity F of which is of frustoconical form. S ,dcsignates the smoke pipe leading from the "furnace, A indicates t e usual hot air escape pipes, and N designates the clean-out neck, having the usual closure C. All parts so far mentioned are of well known construction and such construction forms no part of the present invention, being shown only to give a clear disclosure of the latter. The hood, wherein resides the gist of the. present invention, is designated in a general way by the character, H. The preierred construction of this hood is shown and neciiically described, with the understanding of course that variations may be made without departure from the invention as claimed. The numeral 1 designates a preferably flat, horizontal, top plate having a downwardly bent flange 2 around its edge. A plurality of rectangular, sheet metal plates 3 are secured at their upper edges by bolts 4, to the flange 2, said plates being also detachably bolted to each other as indicated at 5, in overlapping relation, to provide an annular wall Vt. This wall is adapted to surround the upper portion of the furnace, and by having the same formed of detachably mounted sheet metal plates, these plates may readily be cut with-ordinary tinners shears, to any required horizontal dimensions, and their vertical edges may be readily formed with notches 6, so that the notches of ad'seent plates form openings through which the hot air pipes A may pass. Another opening 7 is of course formed in the wall WV, through which the clean-out neck N may ass. P A relatively large opening 8 is formed in the wall W to constitute a cool air inlet for the hood H, and the smoke pipe S passes throu h this opening, so that the ingoing air wi 1 be heated by contact with said smoke pipe. This air is further heated by contact with the upper portion of the furnace, within the hood H, and the heated air is dis-- charged from said hood, throu h a hot air oor or wall register, in any desired room above. In the preferred construction, the lower end of the heat outlet 9 is flared as indicated at 9' and ,is provided with an out-standirw flange 10 which is adapted to be secured by bolts or i. nae ii to the top 1 of the hood H. An opening is of course formed through the top to register with the outlet 9, and this eniiig may be at any desired point, accor mg.

to the selected location for the register. If it is necessary to form this 0 ening in such relation with the opening 8, t at the desired circulation and heating of air would not adjacent the neck N, and provided with a controlling slide 13. This additional air inlet may be at any point except directly over the fire door of the furnace, it being inadvisable to locate it ovei' said door, as it would then be impossible \to prevent smoke and fumes from entering the hood, when giving attention to the fire, unless the slide 13 were closd each time of opening the fire door. In some instances, if the cellar or furnace room is rather dusty, a cool air inlet may lead to the hood H from a point outside the building or from some other desired point.

I prefer to provide the hood H with an outwardly projecting cool air in.let neck 14, whose walls are suitably secured to the wall W, along the edges of the opening 8. The outer ends of this neck 14. may be open as indicated at 15 in Fig. 1, to admit air to the hood, but if it is necessary to locate this end of the neck rather close to the chimney, it may be closed as indicated at 16 in Fig. 2. Then, a cool air inlet opening 17 may be formed in the lower or any other desired "side of the neck 14 as also shown in Fig. 2. If advisable, a pipe may lead to the opening 17 from any desired point.

Novel provision is made for supporting the hood H upon a furnace, and for holding the top 1 against sagging. For this purpose, a pluralitv of hangers 18 are disposed within said hood. In the preferred construction, each hanger 18 is formed from a single metal strap, connected at its lower end with the hood wall W. To establish this connection, the lower extremity of the strap is preferably bent upwardly and outwardly to provide a. hook 19 to engage the lower edge of the aforesaid wall. The upper end of the strap is bent laterally as at 20 to engage the top 1 and hold it against sagging, and the upper portion of the strap 15 inwardly offset from the lower portion thereof to provide a horizontal hook-like portion 21 which is adapted to rest upon the upper end of the furnace. Any desired number of the hangers 18 may be employed and they not only effectively support the hood in proper relation to the furnace, but the hold thetop of said hood against sagging, under the weight of the hot air outlet 8 and any pipes-65.

which may be connected with the latter.

By providing the novel construction shown and described, an effective means is produced for collecting heat which ordinarily escapes from a furnace, and utilizing such heat, so that an appreciable saving in fuel may be effected, as well as maintaining the furnace room at a comparatively low temperature, with the numerous well known advantages. The device is simple and inexpensive, may be easily manufactured and installed, and may bereadily dis-assembled whenever necessary, for instance when it is required to make repairs on the furnace.

As excellent results have been obtained from the general construction disclosed, such construction is preferably followed. However, within the scope of the invention as claimed, modifications may of course be made.

I claim:

1. A furnace hood adapted to extend over and to surround the upper end portion of a furnace, said hood having a hot air outlet and a cool air inlet, and a plurality of hangers within said hood for supporting the same, each hanger being connected at its lower end to the hood, and having a hook portion to rest on the upper end of the furmace and having a portion projecting upwardly from said hook portion into contact with the top of the hood to prevent sagging of the latter.

2. A furnace hood adapted to extend over and to surround the up or end portion of a furnace, said hood having a hot air outlet and a cool air inlet, and a plurality of hangers within the hood for supporting the same,

eelch hanger comprising. a vertically dis posed metal strap having its lower end bent outwardly and upwardly to form a hook to engage the lower edge of the hood, the upper end of said strap being laterally bent to provide a support for the top of the hood, and the upper end portion of'the stliap being inwardly offset from the lower portion thereof to provide a horizontal hook portion adapted to rest upon the upper end of the furnace.

3. The combination with a hot air furnace of a hood mounted on the upper end of the furnace casing and enclosing and spaced from the projecting upper end of said casing, the hood being formed with openings for passage of the hot air pipes of the furnace and an opening for passage of the smoke pipe and formed with an inlet opening for the entrance of air over the smoke pipe to the hood, and with an air exit opening in the top of the hood.

In testimony whereofI have hereunto affixed my signature.

NICHOLAS WV. BETZOLD. 

